摘要
采用激光熔覆技术在TC4(Ti-6Al-4V)钛合金表面制备出了AlCoCrFeNiTi0.5高熵合金熔覆层。运用XRD、OM、SEM、EDS等手段分析了熔覆层的相组成、微观形貌和成分;利用显微硬度仪和多功能摩擦磨损试验机分别检测了熔覆层的硬度和耐磨性能。结果表明:当激光功率P=1500 W,光斑直径D=3 mm,扫描速度V=20 mm/s时,制备出了与基体结合良好,无明显缺陷的高熵合金层。熔覆层主要由面心立方(FCC)结构相、体心立方(BCC)结构相和少量的Laves相组成。熔覆层的平均硬度为699.7 HV0.2,约为基体硬度(298.3 HV0.2)的2.35倍。摩擦磨损试验结果表明熔覆层的耐磨性较基体提高约42倍。
AlCoCrFeNiTi0.5 high-entropy alloy coating was prepared on the surface of TC4(Ti-6Al-4V)titanium alloy by laser cladding technology.The phase composition,microstructure and chemical composition of the coating were investigated by means of XRD,OM,SEM,and EDS analysis,while the hardness and wear resistance of the coating were detected by using microhardness tester and ultra-functional friction testing machine.The results show that when the laser power P=1500 W,spot diameter D=3 mm,and scanning speed V=20 mm/s,the high-entropy alloy coating is metallurgically bonded with the TC4 substrate and no obvious defect is found.The high-entropy alloy coating is mainly composed of face-centered cubic(FCC)and body-centered cubic(BCC)phases with a small amount of Laves phase.The average hardness of the coating is 699.7 HV0.2,which is about 2.35 times that of the substrate(298.3 HV0.2).In addition,the wear resistance of the coating is about 42 times higher than that of the substrate.
作者
吴刚刚
汪选国
曾鲜
王爱华
熊大辉
Wu Ganggang;Wang Xuanguo;Zeng Xian;Wang Aihua;Xiong Dahui(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan Hubei 430070,China;Key Laboratory of Lightweight and High Strength Structure Materials of Jiangxi Province,Nanchang University,Nanchang Jiangxi 330031,China;Wuhan Huagong Laser Engineer Co.,Ltd.,Wuhan Hubei 430223,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第12期1-5,共5页
Heat Treatment of Metals
基金
国家重点研发计划(2016YFB1102702)
中央高校基本科研业务费专项资金(173101003)
江西省轻质高强结构材料重点实验室2017年开放基金(2017IBCD40003)
关键词
TC4钛合金
激光熔覆
高熵合金熔覆层
显微硬度
耐磨性
TC4 titanium alloy
laser cladding
high-entropy alloy coating
microhardness
wear resistance
